Chair rocker base



FIG. 1 is a front isometric view of a chair rocker base;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown in the drawing views are included for purposes ofillustrating environment and form no part of the claimed design.

CLAIM The ornamental design for a chair rocker base, as shown and described. 